In addition to memorizing cards, this ability requires knowledge of probabilities and the ability to predict which cards are probably still in play. In order to enhance their card counting abilities, rummy players canyonorummy use online tools that track card play or play with friends. Players can estimate their chances of drawing useful cards in later turns by mentally noting the high-value cards that have been discarded. Further improving decision-making skills is the ability to identify patterns in opponents' play styles, which can reveal information about their possible hands. Success in Rummy requires the ability to recognize patterns & sequences.